Barker Bros. M Schematic

Barker Bros. M

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Product Information:
Model:M
Manufacturer:Barker Bros.

Schematic Pages

PNG: Page 1 Rider Manual Volume 6

Schematics Content

Page 1:

BARKER BROS.

MODEL P Alignment

MODEL L
MODEL M
Schematic, Voltage
Alignment

10 TUBE MODELS (Consoles)

Without Rear Fuse and Cover
No. 46 Power Tubes

Models L, M, and P Alignment

INTERMEDIATES
No. 46 Power Tubes Connect a 262 K.C. oscillator to the first detector grid (No. 57 cube next to the dial) leaving grid cap in place. Remove oscillator tube (No. 56). Set dial at 100. Hook up vacuum tube volt meter as described and care fully adjust 6 varitor screws for maximum gain (minimum reading of meter). Don't flat top any stages. Have all shields in place. Keep volume control at lowest level.

CONDENSER GANG
Set dial at 100 when gang is at maximum position and tighten dial set screws. Tune in a station (or use an oscillator) to a known frequency signal around 1400 K.C. Carefully adjust oscillator section of gang until frequency is correct on dial.
If the intermediates are balanced on 262 K.C., the dial will now track within 5 K.C. over the entire dial. Adjust first detector section for maximum gain and follow by adjusting band pass trimmers.